The correct choice is:
A. third-person limited; the narrator only knows what one character is feeling.
This is indicated by the use of third-person pronouns (e.g., "the old man," "the son") and the focus on the son’s feelings of being "hampered" and "patronized," which suggests that the reader is privy to the internal thoughts and emotions of that character alone, rather than the thoughts of all characters in the passage.